E Could we "terraform" Mars —that is, change its frozen, thin-aired surface into
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E Could we "terraform" Mars —that is, change its frozen, thin-aired surface into something more friendly and Earthlike? Should we? The first question has a clear answer: Yes, we probably could.Spacecraft, including the ones now exploring Mars, have found evidence that it was warm in its youth, with rivers flowing into vast seas.And right here on Earth, we"ve learned how to warm a planet: just add greenhouse gases to its atmosphere.Much of the CO2 that once warmed Mars is probably still there, in frozen dirt and polar ice caps, and so is the water. Most of the work in terraforming, says NASA scientist Chris Mackay, would be done by life itself. "You don"t build Mars," Mackay says."You just warm it up and throw some seeds." Powerful greenhouse gases could be produced from elements in dirt and air on Mars and blown into the atmosphere; by warming the planet, they would release the frozen CO2, which would quicken the warming and increase atmospheric pressure to the point where liquid water could flow.Meanwhile, says botanist James Graham of the University of Wisconsin, human settlers could seed the red rock with a succession (系列) of ecosystems ?first bacteria and lichens (地衣), which survive in Antarctica, later mosses (苔藓), and after one thousand years or so, redwoods.Getting breathable oxygen levels out of those forests, though, could take thousands of years. However, Mars is in no immediate danger.Some space scientists recently recommended going to the moon or an asteroid (小行星) first, and pointed out the space agency lacks the funds to go anywhere.It didn"t estimate the cost of gardening a dead planet. 72.What is the most essential to make Mars fit for living? A.Turn ice into flowing water. B.Clean the dirty atmosphere. C.Make the atmosphere more suitable. D.Go to the moon or an asteroid first. 73.What does the author think of the idea ofterraforming Mars? A.We could do it. B.We couldn"t do it. C.We should do it. D.We shouldn"t do it. 74.In the botanist"s opinion, man needs to __________. A.enable Mars to clean its atmosphere B.build a greenhouse on Mars C.send some people to settle on Mars D.cultivate ecosystems from lower to higher life form 75.What is the best title for the passage? A.Making Mars the New Earth. B.A Good Way to Change the Universe C.Humans" Great Power. D.Terrible Science and Technology. |
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The other day in school, we were discussing jobs. Our teacher, Mrs. Bolt said that career was very important and that it was never too early to think about your life’s work. Most of the young boys really were not too sure about what they wanted to be. But I knew exactly what I wanted to be, and when Mrs. Bolt asked me, I replied “A truck driver.” “A truck driver?” repeated Mrs. Blot. “Why do you want to be one, Tom?” “Because truck drivers are always on the move. They do not have to sit at desks all day. They are out on the road and they see a lot of the country. The pay is good, too. And you never have any homework.” The class laughed. “Well, Tom.” answered Mrs. Bolt. “You certainly sound quite enthusiastic (热情的). I guess that you don’t like sitting at a desk or doing homework. Is that correct, Tom?” “Yes, I guess so, ” I said. “Well, since you are so interested in becoming a truck driver, I think you should look into the field a little further. I want you to go to the library and take out a book on truck driving. And I want you to write a paper on it and hand it in at the end of the month.” That’s the last time I’ll never tell anybody my secret ambition (雄心). 46.Mrs. Bolt suggested Tom write a book report because . A.she was angry with him. B.she wanted him to learn about the other side of truck driving. C.she was making fun of him. D.she wanted the whole class to follow him 47.Which of the following is NOT true? A.The writer thinks that truck drivers are well paid. B.What Tom said made his classmates laugh. C.It seemed as if Tom did not enjoy doing his homework. D.Mrs. Bolt didn’t want Tom to become a truck driver. 48.Tom wouldn’t tell about his ambition any more because . A.he didn’t think his ambition could come true. B.he just got more homework to do. C.he was laughed at by the whole class. D.he would not be able to become a truck driver. 49.What can we infer about Mrs. Bolt? A.She was unkind to her students. B.She was unfit for her position. C.She was a teacher with ripe experience. D.She always did something strange. |
On a good night when there is no Moon and the air is clear, only up to 4,000 or so stars can be seen by the unaided eye. From ancient times star – watchers have tried to bring some order into the sky by fitting the stars into patterns. The constellations (星座) to which names were given. Observation of the night sky every few hours shows that in the northern hemisphere(半球) the stars appear to turn anticlockwise (逆时针方向) about a point near the Pole Star. As they turn, the stars keep the same positions in relation to each other, and in fact the appearance of the constellations has changed very little over the centuries. Like the Sun and Moon, the stars have a daily journey across the sky, rising upwards in the east and setting in the west – due to the Earth’s daily spin. The Circumpolar Stars, those near the Pole Star, are an exception to this; they are so close to the pole that they never disappear below the horizon (地平线) Although the stars always rise in the same places they do not do so at the same time every day. They rise about 4 minutes earlier each day since the Earth is progressing in its orbit around the Sun; in almost but not exactly a year they again rise and set at the same time. If a certain star is seen to rise in the east exactly when the Sun sets on a particular day, a few weeks later it will be seen well above the eastern horizon at sunset. 58.Which do you think is the best title of the passage above? A.The Earth, the Moon and the Stars. B.Motion of the Stars. C.How to Watch the Stars. D.Appearance of the Stars. 59.Which of the following descriptions cannot be shown in the picture? A.The Circumpolar stars never disappear below the horizon. B.The relative position of the stars in a constellation remains more or less the same as they move. C.Stars appear to turn about a point near the Pole Star. D.Stars appear to turn anticlockwise in the northern hemisphere. 60.From the passage we can learn that __________. A.scientists can observe only up to 4,000 stars on a clear night B.every day the stars always rise in the same place at the same time C.thousands of years later, people may have to rename the constellations as the positions of the stars in them have changed D.since the earth spins from the west to the east every day, most stars rise in the east and set in the west 61.Where is the passage probably taken from? A.A fashion magazine B.A newspaper advertisement. C.A science textbook. D.A collection of science fiction stories. |
第二节:完形填空(20小题;每小题1.5分,满分30分) 阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑 Hi Cindy, Please don"t worry if you feel a little strange around boys.You are in the process of 36 from a little girl into a young woman and there are 37 called hormones (荷尔蒙) that are changing not only your body but your 38 .For example, you say you used to feel at ease _39_ boys and you would usually run and fight one another for 40 .That was Cindy, the little girl.Cindy the 41 woman doesn"t want to fight boys or even run with them 42 your interests are changing.That is what is making you feel strange and it is also 43 to the other girls around you and also to the boys.Your life is 44 a different stage but you should understand that this is (a) 45 normal, and (b) something that will pass quickly. I think you should again try to 46 around boys.You can still talk with them about 47 you like including sports, movies, web sites and celebrities(名人).I 48 that you not try to fight with them, however, because the 49 are becoming much bigger and stronger.I think you will find that you will _50_ being with boys but that your feelings will be different from the 51 they used to be.I know you are not supposed to have a 52 while you are still in school in China, but if you start to find some boys very handsome and you are strongly __53_ to some of them, don"t be surprised. 54 , this is all very normal.For now, you should _55_ your school work, though you will find that some boys are attracted to you.This will be a new adventure for you and my best advice is to relax and enjoy it. Good luck, Brad 36.A.starting B.changing C.surviving D.ranging 37.A.cells B.nutritions C.chemicals D.objects 38.A.mind B.head C.life D.study 39.A.with B.for C.against D.without 40.A.praise B.honor C.good D.fun 41.A.brave B.unique C.smart D.young 42.A.before B.because C.until D.when 43.A.referring B.appealing C.happening D.pointing 44.A.entering B.setting C.reflecting D.representing 45.A.hardly B.possibly C.perfectly D.nearly 46.A.play B.relax C.date D.fool 47.A.somebody B.anybody C.something D.anything 48.A.recommend B.demand C.command D.determine 49.A.girls B.adults C.boys D.kids 50.A.hate B.enjoy C.avoid D.regret 5l.A.model B.standard C.style D.way 52.A.boyfriend B.girlfriend C.degree D.job 53.A.opposed B.attracted C.exposed D.accustomed 54.A.Rather B.Besides C.Again D.Afterwards 55.A.depend on B.decide on C.agree on D.concentrate on |
E Many do-it-yourself homeowners are interested in
trying out solar power to leam about the technology and perhaps to provide energy for limited-use applications. There are a variety of ways to find cheap solar panels (板), including buying used and building your own with factory seconds.Both methods will save money while forcing you to learn the ins-and-outs of a solar power array (阵列). We"ve all seen solar-powered street signs or PV panels being used for various purposes at remote locations. When those units become cracked or chipped and are considered "unsafe", companies are forced to replace them, generally to avoid responsibility issues.Because it"s difficult to get rid of PV panels, many companies, if approached, are willing to give them away or to sell them for modest prices.Depending on the degree of damage present, expect to see performance degradation (降级) in the range of 10% to 60%.A multimeter (万用表) can be used to test the panel before buying.If the panel"s free, take it anyway.It could still be useful in a home solar project. A solar panel is really nothing but a box serving as a container for a large group of solar cells.Factory second solar cells are usually sold on eBay at a small part of their regular cost.The cells come in a variety of sizes.You will need to figure out how much power a single cell produces to determine how many will need to be wired together to form an array. A simple search of the Internet will show numerous sites detailing home solar panel projects.Do-it-yourself lovers are generally quite generous in supply photographs of their work and description of what went wrong and right with the project. Getting cheap solar panels with slight imperfections, either used or through sales of factory seconds, is a perfect solution for home-built renewable energy projects.The high number of solar lovers online provide a wealth of useful information.Only limited skills are required, plus an understanding of the basic wiring involved.All are well within the talents of almost any home handyman.Beyond the satisfaction of having completed the project, you"ll come away with a functional solar panel that will be a source of power for use around the house or at remote locations. Solar energy systems are quickly becoming more popular with homeowners as prices continue to decline. 72.The author writes the passage to introduce ____. A.ways of finding cheap solar panels B.ways of saving energy C.a way of making a solar panel D.a home-built energy system 73.What does the phrase "factory seconds" in the passage refer to? A.Second-hand factory products. B.Cheap but perfect factory products C.Faulty factory solar cells. D.The second best factory solar cells 74.From Paragraph 5, we can learn about home-built energy projects that ____. A.none of them are beyond home handymen B.a lot of useful information is available on the Internet C.a perfect solution is to get cheap and perfect solar panels D.understanding electrical wiring is not necessarily needed 75.What is the author"s attitude towards the future of solar energy systems? A.Optimistic. B.Pessimistic. C.Indifferent. D.Doubtful |
完形填空(共20小题;每小题1.5分,满分30分) 阅读下面短文,从短文后备题所给的四个选项(A、B、C和D)中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。 War, money and power are a few things that countries and people are concerned about. 36 I agree that those things are important,I believe that everyone should start to 37 more on a growing problem — global warming. Global warming will not only 38 our country and our generation, but a1so the entire 39 and future generations. It is 40 because the weather has been a lot warmer over the past few years, which 41 the melting(融化) of the ice in the Antarctic. This will soon cause water levels to 42 and flood parts of the world. Many people ignore this problem because they fee1 43 they can’t do anything about it and have more 44 things to worry about. If we al1 45 so,then our ozone layer(臭氧层)will be 46 and the planet will no longer be able to make life continue to exist. We should do our best to limit the use of our planet’s 47 resources(资源)and keep our air clean. 48 , future generations will suffer from our 49 . Some might feel that they can"t stop global warming from 50 But if every single person does his or her part in keeping the air clean. then it will become a 51 effort. Sure, there are some things that cause pollution and that we won’t be able lo 52 change. This may include cars burning oil,but we can 53 adjust some of these things. People can start carpooling, taking the bus, riding their bikes, or . 54 just walking. If everyone takes 55 now, I believe we can start seeing remarkable results within a few years. 36.A.When B.As C.How D.Though 37.A.depend B.focus C.hang D.remark 38.A.annoy B.interrupt C.affect D.confuse 39.A.world B.continent C.industry D.climate 40.A.failing B.completing C.changing D.occurring 41.A.lies in B.results in C.suffers from D.escapes from 42.A.reduce B.rise C.drop D.move 43.A.as if B.in case C.even though D.if only 44.A.popular B.suitable C.important D.difficult 45.A.do B.keep C.like D.find 46.A.protected B.strengthened C.destroyed D.surrounded 47.A.unlimited B.natural C.recycled D.industrial 48.A.Therefore B.Otherwise C.However D.Instead 49.A.illnesses B.failures C.decisions D.mistakes 50.A.continuing B.arriving C.improving D.disappearing 51.A.physical B.mental C.national D.worldwide 52.A.slightly B.fully C.hardly D.slowly 53.A.at least B.at most C.at first D.at last 54.A.yet B.even C.still D.thus 55.A.time B.turns C.action D.arms |
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